| 摘要 |
A boiler has a cylindrical firebox surrounded by a water jacket which, in turn, is surrounded by a hot water boiler. The firebox has a cylindrical primary furnace, in which a burner for liquid or gaseous fuel is located, and a cylindrical secondary furnace which is of greater diameter than the primary furnace. Combustion gases are removed from the secondary furnace through fire tubes arranged in a circular array around the fire box and extending axially thereof through the water jacket. The water jacket and hot water boiler are separated by a partition which lies against the circular fire tube array inside the water jacket.
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